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2010
Conference Paper
Titel
Deformation behaviour of syntactic iron - micro glass bubble foams
Alternative
Deformationsverhalten von Schäumen aus syntaktischem Eisen und Mikroglasblasen
Abstract
The task for the present investigations was to find out in which way production parameters - especially the sintering time - have an influence on the ductility of syntactic foams. Potential mechanisms can be a modified interface bonding by changing the interface morphology, the internal glass structure (phase demixing was observed in FeNi(50)-specimens) and by diffusion based reactions between spheres and matrix alloy. From the presented results the following conclusions can be drawn: The influence of the sintering holding time (1.5h, 3h and 6h) upon the strength and plateau length is not significant. The length of the plateau regime increases with increasing content of myGB - in the range from 5 up to 10 % myGB the plateau yield strength is mostly independent of the glass bubble content. In future work the influence of the particle size of the iron powder upon the development of the shapes of the hollow spheres will be investigated. Furthermore, experiments are planned with matrix alloys which show a considerably reduced thermal expansion in comparison to iron which lets expect a reduced risk of crack formation during cooling from process to room temperature after sintering.